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Use of Attractants to Suppress Oriental Fruit Fly and Cryptophlebia spp. in Litchi PDF

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Preview Use of Attractants to Suppress Oriental Fruit Fly and Cryptophlebia spp. in Litchi

APRTOTCR.A HCTAAWNATISIA FNO ERN PTEOSMTO SL.U SPPORCE.S (S2IO0N0 6IN) 3L8IT:2CH7I–40 27 Use of Attractants to Suppress Oriental Fruit Fly and Cryptophlebia spp. in Litchi Grant T. McQuate and Peter A. Follett USDA-ARS, U.S. Pacific Basin Agricultural Research Center, P.O. Box 4459, Hilo, HI 96720. E-mail: [email protected] Abstract. Litchi (Litchi chinensis Sonn.) is subject to damage by a range of insect pests, the most important of which are the oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), the koa seedworm, Cryptophlebia illepida (Butler), and the litchi fruitmoth, C. ombrodelta (Lower) (also known as the macadamia nut borer) (Lepi- doptera: Tortricidae). The activity of tephritid fruit flies and Cryptophlebia spp. (here- after referred to as Cryptophlebia) both can lead to several types of fruit defects, in- cluding holes, stains, and release of fruit juices, making it difficult to distinguish which pest caused the damage. Field studies were conducted to minimize the occurrence of these types of fruit defects through use of a spinosad-based protein bait (GF-120 Fruit Fly Bait) to suppress oriental fruit fly populations, and an attractant associated with a contact insecticide (attract-and-kill) technique (Last Call) to suppress Cryptophlebia populations in litchi orchards at the scale of individual farms. The Last Call product used was based on a pheromone blend developed for the macadamia nut borer because preliminary tests identified that this blend was more attractive to both C. ombrodelta and C. illepida than was a pheromone blend developed for the oriental fruit moth, Grapholita molesta (Busck). Overall, based on results from four split plot litchi or- chards, there was no significant difference in oriental fruit fly trap catch between spray and control sections at any trap service date. However, population reduction in the sprayed section of one orchard with a higher B. dorsalis population may have been a result of the spray application. Cryptophlebia trap catch was significantly lower in the treated orchards after the first Last Call application. Cryptophlebia infestation was more than three-fold greater than infestation by oriental fruit fly in each of the or- chards. For both pests, there was no significant difference in infestation rate or infesta- tion-related fruit damage between control and treatment orchards. Improved bait sprays and improved attract-and-kill products and/or larger treatment areas may be needed to provide satisfactory levels of fruit fly and Cryptophlebia suppression. Key words: attract-and-kill, Cryptophlebia ombrodelta, Cryptophlebia illepida, Bactrocera dorsalis, spinosad, Tephritidae, Tortricidae Introduction Litchi (Litchi chinensis Sonn.) is a tropical specialty fruit in Hawaii which has shown a steady increase in acreage planted in recent years. The most important insect pests are tephritid fruit flies, principally oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), koa seedworm, Cryptophlebia illepida (Butler), and litchi fruitmoth, C. ombrodelta (Lower) (Lepidoptera: Tortricidae) (Follett et al. 2003). The activity of tephritid fruit flies and Cryptophlebia spp. (hereafter referred to as Cryptophlebia) can lead to several types of fruit defects, including holes, stains, and release of fruit juices. Since there is an overlap in the damages occurring as a result of these two groups of pests, we chose to conduct a combined 28 MCQUATE AND FOLLETT suppression trial against both groups. The methods of pest suppression for both groups utilized products which included an attractant associated with a toxicant, but different prod- ucts were used for each pest group. For tephritid fruit fly suppression we applied GF-120 Fruit Fly Bait (Dow Agrosciences LLC, Indianapolis, IN), a spinosad-based bait spray re- cently commercialized for use in Hawaii. Spinosad-based baits have been effective against Mediterranean fruit fly (lab: Vargas et al. 2002, Adan et al. 1996; field: McQuate et al. 2005b, Burns et al. 2001, Peck and McQuate 2000) and melon fly (field: Prokopy et al. 2003). Effectiveness in the field of spinosad-based baits against oriental fruit fly has not yet been documented in the literature, though lab studies have suggested that they should be effective (McQuate et al. 2005a; Stark et al. 2004). For Cryptophlebia suppression, we used an experimental Last Call (IPM Technologies, Portland, OR) attract-and-kill product. Attract-and-kill products have shown promise for control of several tortricid pests including codling moth, Cydia pomonella (L.) (Charmillot et al. 2000), lightbrown apple moth, Epiphyas postvittana (Walker) (Suckling and Brockerhoff 1999), and pink bollworm, Pectinophora gossypiella (Saunders) (Hofer and Angst 1995). Charmillot et al. (2000) consider attract-and-kill technology superior to mating disruption for small farms and in areas with high winds and trees grown on slopes, all of which are characteristics of Hawaii’s litchi orchards. Identifying an attractive sex pheromone is the first step in developing an effective attract-and-kill product for koa seedworm and litchi fruitmoth in Hawaii. When properly formulated, attracticide droplets can be more attractive to male moths than calling female moths (Krupke et al. 2002). Chang (1995) demonstrated that the commercial oriental fruit moth pheromone blend of 93% Z8-12:Ac, 4% E8-12:Ac, 1% Z8-12:OH, and 2% Z7-12:Ac is attractive to Cryptophlebia in Hawaii. Oriental fruit moth, (OFM), Grapholita molesta (Busck) (Lepidoptera: Tortricidae), pheromone has been used in attempts at mating disruption for Cryptophlebia in macadamia (V. Jones unpub- lished). Recently a new pheromone blend was developed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) for Cryptophlebia ombrodelta (also known as the macadamia nut borer [MNB]). IPM Technologies (Portland, OR) formulated the MNB pheromone into an experimental Last Call attract-and-kill product. The purpose of this study was first to compare the attractiveness of the MNB pheromone with the OFM pheromone to Cryptophlebia spp. in Hawaii. Second, this study tested the efficacy of Last Call MNB and GF-120 Fruit Fly Bait spray for suppression of Cryptophlebia and oriental fruit fly, respectively, in litchi at the scale of individual farms. Materials and Methods Cryptophlebia Pheromone Study. The test comparing the attractiveness of the CSIRO MNB pheromone blend and the OFM blend (IPM Technologies, Portland, OR) was con- ducted in a macadamia nut orchard known to support Cryptophlebia populations in Kapaau, HI, in July–August 2002. Approximately 320 ha of contiguous macadamia nut orchards are located in this area. Macadamia nuts are harvested during 8 months from April–May to January–February, and Cryptophlebia can be trapped throughout the year, although distinct peaks occur (Jones 2002). Four groups of three neighboring trees were selected in a 4.0 ha block near the center of the area. Trees (a mix of cultivars 344, 246, and 508) were 25 years old, approximately 6.0 m in height, and spaced 4.5 x 9.0 m. Each group of trees was sepa- rated by a minimum of four rows and a distance of 60 m. Each tree in a group was randomly selected to receive either MNB pheromone blend, OFM pheromone blend, or a control trap with no lures. Each pheromone blend was loaded onto separate rubber septa at a rate of 10 mg per septum at IPM Technologies (Portland, OR). Pheromone lures applied to rubber septa were placed in delta traps (Scenturion Inc. Guardpost LPD, Clinton, WA) suspended ATTRACTANTS FOR PEST SUPPRESSION IN LITCHI 29 1 2 1 2 Ola’a 0.40 (0.21/0.19) ha Fruiting Trees: 31/32 Kurtistown 0.88 (0.61/0.27) ha Fruiting Trees: 100/43 Hawaii Island 1 2 2 2 Wai’akea0.23 ha Site Locations Kea’au 1.33 (0.77/0.56) ha Fruiting Trees: 23 Fruiting Trees: 75/52 1 22 1 GF-120 Spray 3 Last Call Pana’ewa 1.95 (1.02/0.93) ha 2 No Spray 4 No Last Call Fruiting Trees: 107/24 Figure 1.Site location of trials and assignment of treatments to orchards. Overall orchard area, followed by the split between the area sprayed by GF-120 and the area unsprayed and the numbers of fruiting trees in each section (area sprayed/area unsprayed) is indicated for each orchard. Overall sizes of the rectangles representing the orchards are proportional to the actual orchard areas. from branch tips within the row at eye height and moth catch was recorded after two weeks. The experiment was repeated on two dates, two weeks apart. Study Sites for Suppression Trials. The suppression study was conducted in five litchi orchards on Hawaii island (Fig. 1): a 2.8 ha orchard in Panaewa, a 0.6 ha orchard in Keaau, a 1.2 ha orchard in Kurtistown, a 0.4 ha orchard in Olaa and a 0.3 ha orchard at the Waiakea Agricultural Research Station on the island of Hawaii. These orchards reflect the variability in size of litchi orchards in Hawaii. The orchards ranged from 70 – 250 m in elevation. The cultivar Kaimana was planted in all orchards. The Kurtistown orchard also included the cultivars Bosworth and Groff; however, these cultivars bore fruit later in the season than Kaimana and the study was terminated before these fruits ripened. Fruit set varied among the orchards, with 75%, 89%, 95%, 21% and 62% of trees bearing fruits in the Keaau, Kurtistown, Olaa, Panaewa and Waiakea orchards, respectively. Moth pheromones are long range attractants whereas fruit fly baits are short distance attractants. For this reason we chose to use a split plot with fruit fly bait sprays and whole orchards for Last Call attract and kill applications against Cryptophlebia. The idea with attract and kill is to eliminate all males from the resident and immigrating population. This is best done by treating whole, 30 MCQUATE AND FOLLETT isolated orchards. Our choice of orchards to treat for Cryptophlebia was based on isolation from good hosts outside the orchard (that might supply moths) rather than size or other characteristics. Insect Population Monitoring. Fruit Fly Populations. Fruit fly populations were moni- tored using yellow bottom plastic dome traps (Biosys, Inc., Palo Alto, CA, U.S.A.) baited with a mixture of 8.0% (w/w) Solulys AST (Roquette America, Inc., Keokuk, IA), 4.0% (w/ w) borax, and 88.0% (w/w) water. Traps were deployed on 25 April, 2003, at least two weeks before the first spray and the first litchi fruit harvests in any of the orchards. Six traps were placed in each control section and six traps were placed in each treatment section of each orchard (see below) and were serviced weekly until 2 July, 2003. Cryptophlebia Populations. Cryptophlebia populations were monitored using delta traps containing CSIRO macadamia nut borer lures (IPM Technologies, Portland, OR), with three traps per block. Traps were serviced every two weeks. Trap monitoring was begun earlier in lower elevation orchards (Panaewa and Waiakea), resulting in one additional trap service for these orchards compared to the other three orchards. Recovered moths were identified to species using size differences and distinguishing hind leg characteristics (Jones 2002). Voucher specimens were confirmed by Dr. John Brown at the USDA Systematic Entomol- ogy Laboratory, Beltsville, MD. Treatments. Bait Spray for Fruit Fly Suppression. Each of four orchards (Keaau, Kurtistown, Olaa, and Panaewa) was subdivided into treatment (sprayed) and control (unsprayed) sections as indicated in Fig. 1. In all cases there was some separation between these two sections. Typically, they were separated by a road with or without windbreak trees. The bait spray used was GF-120 Fruit Fly Bait (Dow Agrosciences LLC, Indianapo- lis, IN). The spray was applied as spots on the underside of the litchi tree leaves at a rate of 3.9 liters of diluted product (prepared according to label directions) per hectare. Fruiting trees received multiple spots, with more spots applied to larger trees and trees with more fruits. Nonfruiting trees were also treated, but at a lower rate, with only one spot applied per tree for smaller trees. This application approach was used so that the bait was applied pref- erentially near ripe fruits where higher densities of flies were expected. Bait sprays were applied once a week starting before the first fruit harvest. Attract-and-kill for Cryptophlebia. Two orchards (Keaau and Panaewa) were treated with the Last Call® MNB attract-and-kill formulation (IPM Technologies, Portland, OR) at monthly intervals throughout the fruit development period. The treatment interval selected was in line with the manufacturer’s recommendation (4–6 weeks), based on research with codling moth (Charmillot et al. 2000). The Keaau orchard was treated on 13 May and 17 June, 2003. The Panaewa orchard was treated on 9 May and 13 June, 2003. Last Call incorporates a Cryptophlebia sex pheromone (0.16%) and insecticide (permethrin, 6.0%) in a water- proof gel carrier and was applied to orchards at a rate of 1200, 50 µl droplets per acre (13 droplets per tree). The pheromone concentration was chosen by the manufacturer based on research with codling moth (Charmillot et al. 2000). Three other orchards within a 10 km radius (Kurtistown, Olaa and Waiakea) were used as untreated control orchards (see Fig. 1). Assessment of Infestation and Fruit Damage. Every two weeks throughout the fruiting season (8 May–24 June, 2003), 100 ripe fruits were collected from each section of each orchard. Fruits were weighed and then assessed visually for the presence on the fruit surface of cracks, holes, juice, stains and Cryptophlebia eggs or larvae. Fruits were then opened and searched visually for the presence of any fruit fly eggs. In order to identify the species of fruit fly, all recovered fruit fly eggs were placed on sections of ripe papaya and held in screen topped buckets with sand on the bottom to serve as a pupation medium. After two weeks, the sand was sieved for collection of any pupae. The pupae were then transferred to small screen- topped containers holding only sand and any emerged adults were identified to species. ATTRACTANTS FOR PEST SUPPRESSION IN LITCHI 31 2.0 C. illepida C. ombrodelta 1.5 1.0 0.5 0.0 MNB OFM Pheromone Figure 2.Average catch per trap per day of C. illepida and C. ombrodelta in delta traps baited with either CSIRO-formulated macadamia nut borer (MNB) pheromone blend or oriental fruit moth (OFM) blend. Statistical Analyses. Comparison of fruit fly population levels between sprayed and con- trol orchard sections (fruit fly suppression test) was made using paired t-tests of log trans- 10 formed [log (10x + 1)] (Sokal and Rohlf 1981) trap catch results. Because three of the 10 orchards had very low oriental fruit fly populations, so there was little potential for impact of the bait sprays, separate t-tests of log transformed trap catch results were also calcu- 10 lated for the Panaewa Orchard where oriental fruit fly populations were higher. Comparison of Cryptophlebia population levels between sprayed and control orchards (Cryptophlebia suppression test) was made using t-tests of log transformed [log (10x + 1)] combined 10 10 species trap catch results (SPSS Inc. 2000). Comparison of percentage infestation by orien- tal fruit fly and fruit damage between sprayed and control orchard sections was made using paired t-tests of arcsin transformed (arcsin[sqrt[proportion damaged]]) proportion damaged data, using different sample dates as replicates. Comparison of percentage Cryptophlebia infestation and fruit damage between Last Call treated and control orchards was made using t-tests of arcsin transformed proportion damaged results (arcsin[sqrt[proportion damaged]]). Results Cryptophlebia Pheromone Study. The trap catch data for the first and second week were not significantly different so both weeks were combined for further analysis. The MNB lure caught significantly more C. ombrodelta than the OFM lure (1.4 vs. 0.05 moths per trap per day) (t = 5.2, df = 7.1, P = 0.001). The MNB lure also caught significantly more C. illepida than the OFM lure (0.4 vs. 0.06 moths per trap per day) (t = 3.4, df = 7.9, P = 0.009) (Fig. 2). Insect Populations. Fruit Flies. Average trap catch in spray and control sections of each orchard at each trap servicing date is presented in Table 1. Although no bait sprays were 32 MCQUATE AND FOLLETT ur litchiest trap 00)02) 07)00) 06)02) 05)23) 40) ections of foause the high 6 0)0.00(0.9)0.02(0. 3)0.07(0.5)0.00(0. 2)0.10(0.3)0.02(0. 4)0.10(0.2)0.62(0. 5)2.05(0. day) ( SEM) in sprayed and control s±ata is included here for comparison bec eeks post-initiation of weekly sprays 345 0.00(0.00) 0.02(0.02)0.00(0.00.06(0.03)0.02(0.02)0.12(0.0 0.03(0.02)0.02(0.02)0.07(0.00.06(0.03)0.04(0.05)0.05(0.0 0.03(0.02)0.04(0.05)0.02(0.00.03(0.02)0.15(0.11)0.07(0.0 0.56(0.24)0.35(0.14)0.31(0.11.17(0.24)1.21(0.28)1.33(0.3 0.08(0.05)1.85(0.64)3.36(0.5 trap per p catch d W 2 00(0.00)02(0.02) 00(0.00)05(0.03) 00(0.00)00(0.00) 71(0.28)07(0.23) 26(0.11) r a 0.0. 0.0. 0.0. 0.1. 0. er s + females] pWaiakea) but t 1 0.00(0.00)0.06(0.03) 0.03(0.02)0.03(0.02) 0.00(0.00)0.00(0.00) 0.94(0.16)1.11(0.21) 0.00(0.00) aled ( ([mhar 00)00) 16)11) 02)03) 45)34) 03) ntal fruit fly trap catch e applied in the fifth orcall were recorded there. Weeks pre-spray 12 0.05(0.05)0.00(0.0.00(0.00)0.00(0. 0.24(0.14)0.22(0.0.26(0.09)0.28(0. 0.36(0.13)0.03(0.0.05(0.05)0.08(0. 0.38(0.19)1.53(0.0.71(0.35)1.56(0. 0.07(0.05)0.08(0. err Table 1. Mean total oriorchards. No sprays wecatches of the study ove OrchardTreatment KeaauSprayControl KurtistownSprayControl OlaaSprayControl PanaewaSprayControl WaiakeaControl ATTRACTANTS FOR PEST SUPPRESSION IN LITCHI 33 Table 2. Mean trap catch (moths per trap per day) (± SEM) of male Cryptophlebia in control litchi orchards and orchards treated with Last Call. Weeks post-treatment Orchard Treatment Pre-treatment 2 4 6 Keaau Last Call 2.35 (0.18) 0.17 (0.11) 0.17 (0.04) — Kurtistown Control 1.62 (0.20) 1.02 (0.15) 1.50 (0.60) — Olaa Control 0.43 (0.04) 0.27 (0.12) 0.50 (0.06) — Panaewa Last Call 4.07 (1.23) 0.00 (0.00) 0.05 (0.05) 0.13 (0.07) Waiakea Control 0.57 (0.14) 0.07 (0.07) 0.72 (0.23) 0.46 (0.11) applied in the Waiakea orchard, so this orchard had no paired treatment/control subsections, trap catch data is also included from this orchard in the table because it documents the highest oriental fruit fly populations recorded in the course of the study. For all four or- chards considered together, there was no significant difference in oriental fruit fly trap catch between spray and control sections at any trap service date. At three of the sites (Keaau, Kurtistown, and Olaa) oriental fruit fly populations were low throughout the study. From the time of the first harvest until the end of the trial, oriental fruit fly trap catch was no higher than 0.15 flies/trap/day in any control or bait-treated section in the three orchards. The oriental fruit fly populations in the Panaewa and Waiakea orchards, however, were considerably higher than in the other three orchards. After the first spray in the Panaewa orchard, average trap catch in the sprayed section was lower than in the control section on all dates, with catch significantly less at week 6 (t = 3.299, df = 9.3, P = 0.009) and week 7 (t = 3.328, df = 8.7, P = 0.009) (Fig. 3). Average trap catch in the Waiakea orchard was less than 0.30 flies per trap per day through week 5, but then increased considerably at the end of the season reaching 1.9 (week 6), 3.4 (week 7) and 2.1 flies per trap per day (week 8). Cryptophlebia. Pre-treatment and post-treatment trap catch in each of the orchards is presented in Table 2. The proportion of each Cryptophlebia species varied widely among trap recoveries. The proportion of C. ombrodelta ranged from 0 to 100%, with an average of 33.9%. There was no significant pre-treatment difference in trap catch of total moths in control orchards versus orchards treated with Last Call (t = 1.42, df = 1, P = 0.39). How- ever, significantly fewer moths were caught in the treated orchards two weeks after the initial treatment with Last Call (t = -21.94, df = 1, P = 0.03). At four weeks, trap catch in the treated orchards was numerically less than in the control orchards, but the difference was not statistically significant (t = -7.66, df = 1, P = 0.08). Infestation. Fruit Flies. Table 3 summarizes the oriental fruit fly infestation in the litchi fruits collected at each of the orchards. There was, overall, no significant difference in infestation rate between sprayed and control sections of each of the four orchards. Infesta- tion rate was generally low. The maximum infestation rate in any of the orchards with the split spray/control sections was 3.8%, found in the last fruit collection at the Pana’ewa orchard. This was also the orchard (among those with the split spray/control sections) that 34 MCQUATE AND FOLLETT s ruit sample Eggs pernfested fruit 10— ———— —49.56.7 6.45.112.5 13.1 hi f i c e lit p ed in ri o. eggs 100 0000 045720 4551150 355 r N e v o c e r s g g umber of eorchard. % fruitsinfested 0.32 (0.32)0.00 (0.00) 0.000.000.33 (0.33)0.00 (0.00) 0.000.851.95 (0.56)0.97 (0.55) 3.273.10 (1.69)3.82 (1.47) 8.65 (3.89) n” d y nnl on aol o uit fly infestatid a fifth “contr No. fruits infested 10 0010 0163 71012 27 percentage oriental frs of four orchards an Total no.fruits collected 315325 103100305311 96117308306 214325314 312 EM) ction ons age ( S±ntrol se No.collecti 33 1133 1133 133 3 ro ec vd y y al fruits collected, aom both treated an Treatment SprayControl Spray–presprayControl–prespraSprayControl Spray–presprayControl–prespraSprayControl PrespraySprayControl Control Table 3. Totcollected fr Orchard KeaauKeaau KurtistownKurtistownKurtistownKurtistown OlaaOlaaOlaaOlaa PanaewaPanaewaPanaewa Waiakea ATTRACTANTS FOR PEST SUPPRESSION IN LITCHI 35 2.5 2.0 1.5 1.0 0.5 Sprayed Section 0.0 Control Section Spray date Period of Fruit Harvest -0.5 4/28/03 5/12/03 5/26/03 6/9/03 6/23/03 7/7/03 Date Figure 3.Average total (male + female) oriental fruit flies per trap per day in protein bait traps in the sprayed versus the control sections of the Panaewa litchi orchard. had the highest oriental fruit fly population based on trap catches. A higher infestation rate (8.7% overall; 15.4% in the last collection) was found at the Waiakea control orchard. In- creased infestation rate over time was found only in the Waiakea control orchard where the infestation rate increased at the end of the fruiting season from 1.92% (29 May, 2003) to 8.65% (5 June, 2003) to 15.38% (25 June, 2004). Of the total of 693 fruit fly eggs recovered from the litchi fruits from all sites combined, 44.9% (311) developed to the adult stage and all were found to be oriental fruit flies. Cryptophlebia. Cryptophlebia infestation in the litchi fruits collected at each of the or- chards ranged from 5.78 to 26.6% (Table 4). Cryptophlebia infestation was at least three- fold higher than infestation by oriental fruit fly in each of the orchards. Overall there were no significant differences in Cryptophlebia infestation rates between treated and control orchards at any of the collection times. The highest Cryptophlebia infestation rates were found in the Panaewa orchard (17.7%),which received Last Call treatments, and the un- treated Waiakea orchard (26.6% overall; 37.1% in the first collection). Fruit Damage. Table 5 summarizes the occurrence of fruit defects in the sampled fruits that could relate to damage by fruit flies and/or Cryptophlebia. There was no significant difference in any of the defects in the sprayed versus control orchard sections or in orchards treated with Last Call versus untreated orchards. The most common defect was the presence of a stain on the fruit. This defect was present on 6.5–20.8% of the fruit across all orchards. All defects were most prevalent in the Waiakea orchard, which had the highest population of oriental fruit fly and the highest infestation rates of both oriental fruit fly and Cryptophlebia. 36 MCQUATE AND FOLLETT ol orchards. Eggs perinfested fruit 1.30 1.39 1.31 1.29 1.22 1.33 r nt o c d gs ated an No. eg 48 103 114 58 129 109 e r ollected from t Avg. % fruitsinfested 5.80 (0.75) 9.13 (1.31) 10.68 (2.60) 20.09 17.29 (2.31) 26.48 (5.58) c uit samples No. fruits infested 37 75 91 45 113 83 r hi f d c e ation in lit Total no.uits collect 640 819 827 224 639 312 st fr e nf bia i ons hle No.ecti 3 4 4 1 3 3 op oll pt c Cry ment e ( SEM) ± Treatment Last Call Control Control Pre-Treat Last Call Control g a r e Av wn Table 4. Orchard Keaau Kurtisto Olaa Panaewa Panaewa Waiakea

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